The most inexpensive way to heat a house depends on your local utility rates, but operating a modern, high-efficiency heat pump or utilizing low-cost natural gas generally provides the lowest operational expenses. Beyond the primary equipment, the cheapest way to heat your home is through aggressive energy conservation: sealing air leaks around windows and doors with weatherstripping, adding thick attic insulation, opening south-facing window curtains during sunny winter days to harness natural solar heat, and lowering your thermostat while wearing warmer layers.
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